/*
 * Copyright 2012 Gregor Schauer
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package at.schauer.gregor.vienna.test;

import at.schauer.gregor.vienna.annotation.Id;
import org.springframework.expression.Expression;
import org.springframework.expression.ExpressionParser;
import org.springframework.expression.spel.standard.SpelExpressionParser;

/**
 * @author Gregor Schauer
 */
public class SimpleMathService implements MathService {
	@Override
	public Double calc(String expr) {
		ExpressionParser parser = new SpelExpressionParser();
		Expression expression = parser.parseExpression(expr);
		return ((Number) expression.getValue()).doubleValue();
	}

	@Id
	public String name() {
		return this.getClass().getSimpleName();
	}
}
